I played around a bit with Jared's sqlite datadump. My link test uses pretty naive regex matching to find the most-linked-to questions, so the results might not be 100% accurate, but the overall direction should be correct.

According to this test, these are the 25 most-referenced questions on Stack Overflow:

This example clearly illustrates a topology and metric with inherently valuable qualities. It identifies a community and opens up the discussion to include multiple questions. It will persist in reflecting value over long periods of time because it is has slow growth. It is insulated from abuse by the effort required to add non-duplicate questions that reference another. I think that over a period of years this metric would be very valuable for SO and other SE sites.
–
Brian M. HuntOct 2 '09 at 15:07

I was thinking about this the other day. It would be interesting to have a sort of graphical display, where you could zoom appropriately, but showing the interrelationships between questions. It would probably be more work than it would be worth. A simple list sounds like a good idea though...